Record stop



July 3, 1928. 1,675,852

' E. s. GEER RECORD STOP Filed May 29, 1924 INVE TO W ATTORNEYS IPatented July-3, 192a.

' UNITED STATES EDMUND S. GEER, OF NEW YORK, N. Y.

RECORD STOP.

Application me ma as,

This invention relates to phonogra hs, and

more particularl to the stoppage honographs on the completion of a recorAn object of this invention is to rovlde a new and improved phonograph,which will be automatically stopped when the playing record has beencompleted.

A further object is to provide a new and improved phonograph recordwhich when used or. a phonograph will automatically cause the latter todiscontinue playing when the end of the record has been reached.

The invention accordingly comprises the features of construction,combinations of elements, and arrangement of parts, which will beexemplified in the constructions hereinafter set forth and the scope ofthe application of which will be indicated in the claims.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

For a fuller understanding of the nature and objects of the invention,reference .5 should be had to the following detailed description takenin connection with the accompanying drawin in which:

Figure 1 1s a top p an of a device embodying this invention;

Fig. 2 is a vertical section;

Fig. 3 is a section similar to Fig. 2 but of a slightly modified form ofconstruction; Figs. 4, 5 and 6 are fragmentary enlarged views showingvarious positions of a phonograph needle on a record in accordance withthis invention;

Figs. 7 and 8 are details of modified forms of the slot;

Figs. 9, 10 and 11 are views similar to Figs. 1, 4 and 5 respectivelybut of a modified form of construction.

The numerals 1 and 2 designate respectively the tone arm and turn tableof a phonograph, and the numeral 3 designates a record which may be ofthe disc type. The disc 3 is rovided with the usual sound groovesdeslgnated generally by the numeral 4, with which a needle 5 on the tonearm is adapted to co-operate to reproduce the sound.

In accordance with this invention, means are provided upon the recordfor co-operating to bring the record to a stop when the pla ing thereofhas been completed.

Since the tone'arm itself moves over the record as it is played, apractical manner of 1924. Serial No. 716,548.

accomplishing this result is to cause the said means to co-operate withan element on the tone arm to cause the stop age: Thus the record itselfmay be so designed or equipped as to grip the needle to cause suchincreased resistance or such locking action necessary to brin the recordto rest. Thereafter the turn ta le itself, if it has not al-.

ready stopped, will he brought to rest by the friction between itselfand the record.

The last turn of the sound groove 6 leads I into a groove 7 (see Fig. 1)which may. if desired, be deeper than the sound groove in order torestrain the needle more securel from 'umping to the side. This grooveleads irectly to the means for stopping the record.

As illustrated, an opening 8 is provided in the record into which thegroove 7 leads and this opening terminates in the narrower slot 9, andthe opening 8 and slot 9 are so arranged that when the point of theneedle 5 has passed beyond the end of the groove 7, it will fall intothe opening 8 and immediately, as the record is rotated, pass into theslot 9. This slot will be of such size and shape as firmly to grip theneedle to bring the record to rest.

In practice, it is preferred ,to rovide a plurality of orifices 8 and 9equal y spaced around the record so that, if for an reason the needleshould traverse the first s ot without checking the movement of therecord, it may thereupon fall into the second slot and be there gripped.

The operation of this form will thus be evident. The needle traversesthe sound groove until the record portion thereof is completed. Itthereupon passes as shown at 6 into the groove 7 as illustrated in Fig.6. When the needle passes the front edge of the opening 8, itimmediately falls and encounters the edges of the slot 9. It may, infact, if the slot is so designed, strike the front edges so as to becomeimmediately wedged in the slot with suflicient force to stop the record.Otherwise, it will move through the slot imposing a drag upon the recordby reason of the friction between the needle and the slot, until therecord is brought to rest.

In certain instances, it may be desirable to embody special frictionmaterial at the edges of the slot to assist in bringing the record to astop, but satisfactory results have been dobtained with the forms ofslots illustrate In Figs. 7 and 8, there is illustrated modifiedconstructions of the slot which may be used to bring the record to rest.In the form of Fig. 7, the slot is made sinuous, whereby it presentsvarying angles to the needle. In the form illustrated in Fig. 8, thewidth of the slot is varied at intervals to rovide a wedgin action onthe needle.

Ks the record an turn table rotate, they possess considerable momentumandthus in order to bring the record quietly and quickly to rest andthrough it to stop the mechanism of the honograph, it is in manyinstances desirab e that the friction between the record and the turntable be so adjusted that the needle may first bring the record to astop allowing it to slide upon the turn table, and the turn table thissubsequently be brought to rest by the drag thus imposed upon it.

For these reasons and a so in order that the friction between the recordand the turn table may be subseqnently independent of whether the recordhas been slightly war ed or not, it has been found desirable to al owthe record to rest upon a smaller surface at a predetermined distancefrom the, center, whereby a definite amount of frictional drag may beassured.

In the form illustrated in Fi 2, this may be accomplished by placing a150 of felt 10 beneath the central portion of the record. Where this isdone in view of the fact that at the slot the needle may in manyinstances pass completely throu h the record, it is desirable that thisfelt isc shall be of diameter smaller than the diameter of the circle onwhich the slot 9 is laced. Should such a circle prove too smal to affordsufiicient friction to brin the turn table to rest, the

surface of the disc may be especiall roughened as shown at 11 toincrease an localize the friction, and this rou hened surface ispreferabl raised above t e main playing surface 0 the disc as shown, inorder to provide space beneath the disc at the point where the needlemay extend completely through the opening 8.

In the form of the device illustrated in Fig. 3, an annulus 10 of feltis provided, whose inner diameter is sufliciently reat to give thenecessary friction to stop t e turn table without especially rougheningthe surface.

In the form illustrated in Figs. 9, 10 and a 11, the slot is tapereg}iincreasing in width from the top towa the bottom and the fore desirablet at the friction between the record and the turn table be such as toperm1t the turn table to be brought slowly to rest. For this reason,this form of the invention is illustrated with the roughenedsurface 11ms described for the prior form. Since certaln changes may be made inthe I above construction and different embodiments of the inventioncould be made without departing from the scope thereof, it is intendedthat all matter contained in the above description or shown in theacompanying drawing shall be interpreted as illustrative and not in alimiting sense.

It is also to be understood that the following claims are intended tocover all of the eneric and s ecific features of the invention iereindescri ed, and all statements of the scope of the invention which, as amatter of laliguage, might be said to fall therebetween. avlng describedmy invention what I claim as new and desire to secure byLetters Patent,is

1. A device of the characterv described, comprising a phonograph recordadapted to be used with a tone arm carrying a needle, said record havinga slot therein associated with the end of the sound groove of sufiicientde th and width to engage the parallel sides 0 the needle to lock therecord in place.

2. A device of the character described,

EDMUND s. GEER.

